change styles for the dropdown, make things work nicely on mobile

src/App.vue

src/components/nav_panel/nav_panel.js

src/components/nav_panel/nav_panel.vue

src/components/popover/popover.js

src/components/popover/popover.vue

src/components/side_drawer/side_drawer.vue

src/components/status_popover/status_popover.vue

src/components/timeline/timeline.vue

src/components/timeline_menu/timeline_menu.js

src/components/timeline_menu/timeline_menu.vue

src/i18n/de.json

src/i18n/en.json

src/i18n/fi.json